DESCRIPTION OF PLATE IX. 



Watermelon wilt. Hothouse experiment. Washiugtou, D. 0. Spring of 1895. 



1. Pots of the same series as PI. VIII, but ijhotographeil some weeks later. All 

 of the plants were killed by the fuugus except the three mentioned above. Seeds 

 planted March 12; photograph made some time in May. 



2. Control plants growing in nninoculated (healthy) soil. None of these plants 

 contracted the disease, but toward the close of the experiment all were dwarfed by 

 leaf aphides. 



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